openEuler update for screen

1) Improper Neutralization of Argument Delimiters in a Command

EUVDB-ID: #VU50842

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-26937

CWE-ID: CWE-88 - Argument Injection or Modification

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to incorrect processing of user-supplied data in the encoding.c file. A remote attacker can pass specially crafted UTF-8 character sequence to the GNU Screen application and perform a denial of service attack or execute arbitrary code on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 20.03 LTS SP1 - 20.03 LTS

screen-help: before 4.8.0-2

screen-debuginfo: before 4.8.0-2

screen-debugsource: before 4.8.0-2

screen: before 4.8.0-2

CPE2.3

• cpe:2.3:o:openeuler:openeuler:20.03:LTS SP1:*:*:*:*:*:*
• cpe:2.3:o:openeuler:openeuler:20.03:LTS:*:*:*:*:*:*
• cpe:2.3:o:openeuler:screen-help:*:*:*:*:*:openeuler:*:*
• cpe:2.3:o:openeuler:screen-debuginfo:*:*:*:*:*:openeuler:*:*
• cpe:2.3:o:openeuler:screen-debugsource:*:*:*:*:*:openeuler:*:*
• cpe:2.3:o:openeuler:screen:*:*:*:*:*:openeuler:*:*

External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2021-1090

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.